Review of Boheme 10-meter

Boheme 10-meter anno 1980. Boheme 10M

Basic specs.

The Boheme 10-meter aka Boheme 10m is a sailboat designed by the Danish maritime architect Per Qvist in the late seventies. Less than 100 boats have been produced. The Boheme 10-meter is built by the Danish yard Dantec Marine ApS.

Looking for a new boat? Find a Boheme 10-meter or similar boat for sale

Hull

The hull is made of plywood.

Interior

Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.

Rig

The boat equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a genaker or a spinnaker for optimal speed.

Keel

Keel of Boheme 10-meter.

The Boheme 10-meter is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.

The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.

The boat can enter most marinas as the draft is just about 1.50 - 1.60 meter (4.92 - 5.22 ft) dependent on the load. See immersion rate below.

Engine

Boheme 10-meter is typically equipped with an engine at 5.0 hp (3 kW), which gives a max speed about 3.9 knots.

Sailing characteristics

This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.

Stability and Safety

What is Capsize Screening Formula (CSF)?

The capsize screening value for Boheme 10-meter is 1.96, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 7.0 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Boheme 10-meter is about 142 kg/cm, alternatively 800 lbs/inch.
Meaning: if you load 142 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 800 lbs cargo on the boat it will sink 1 inch.

Sailing statistics

This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.

Motion Comfort Ratio

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Boheme 10-meter is 15.5.

Comparing this ratio with similar sailboats show that it is more comfortable than 7% of all similar sailboat designs. This is a comfort value significantly below average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Boheme 10-meter is 4.03.

Compared with other similar sailboats it is slimmer than 98% of all other designs. It seems that the designer has chosen a significantly more speedy hull design. This type of design is also referred to as 'needle'.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Boheme 10-meter is 58%.

This ballast ratio shows a righting moment that is higher than 99% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Boheme 10-meter is 112 which categorizes this boat among 'ultra light racers'.

95% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

SA/D (Sail Area Displacement ratio)

What is SA/D (Sail Area Displacement ratio)?

The SA/D for Boheme 10-meter with ISO 8666 reference sail is 19.7, with a 135% genua the SA/D is 22.8.

The SA/D ratio indicates that it is faster than 86% of all similar sailboat designs in light wind.

Over- / underrigged

The Boheme 10-meter has more rig than 86% of all similar sailboats, which indicates that the boat is significantly overrigged.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Boheme 10-meter is 58

The relative speed performance is 58 which means that a it is faster than 58% of all similar sailboat designs.

Maintenance

Bottom Paint

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 25m² (269 ft²).
Based on this, your favourite maritime shop can tell you the quantity you need.

Note: If you use a paint roller you will need more paint than if you use a paintbrush.

Rig

Dimensions of sail for fractional rig.

Are your sails worn out? You might find your next sail here: Sails for Sale

If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.

**Guiding dimensions of running rig**
Usage	Length		Diameter
Mainsail halyard	28.1 m	(92.0 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	28.1 m	(92.0 feet)	10 mm	(3/8 inch)
Spinnaker halyard	28.1 m	(92.0 feet)	10 mm	(3/8 inch)
Jib sheet	10.4 m	(34.0 feet)	12 mm	(1/2 inch)
Genoa sheet	10.4 m	(34.0 feet)	12 mm	(1/2 inch)
Mainsheet	25.9 m	(85.0 feet)	12 mm	(1/2 inch)
Spinnaker sheet	22.8 m	(74.8 feet)	12 mm	(1/2 inch)
Cunningham	3.5 m	(11.3 feet)	10 mm	(3/8 inch)
Kickingstrap	6.9 m	(22.6 feet)	10 mm	(3/8 inch)
Clew-outhaul	6.9 m	(22.6 feet)	10 mm	(3/8 inch)

Boat owner's ideas

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.

Finally

We are always looking for new photos. If you can contribute with photos for Boheme 10-meter it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us. Criticism helps us to improve.

References

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.